APHILOTHKIX MALFIGHII. 87 



its l)ulk is visible, the lower third being concealed by 

 the leaf-scales. These do not fall off. 



The gall is composed of two layers, the outer form- 

 ing a soft, thick, sappy, green rind, which envelops 

 the larval chamber all the while it is on the tAvig, but 

 " when the gall falls out of the bud the sappy rind is 

 loosened, and the woody inner gall left bare " (Adler, 

 ' Alternating Generations,' p. 40). If, however, the 

 gall is gathered before maturity, this exterior dries 

 and shrinks, producing irregular reticulations which 

 unite at the apex in a point, caused by a small cone 

 beneath. The inner layer, which forms the larval 

 chaml^er, has thin walls enclosing a large cavity, 

 whitish inside. The outer surface of these walls is 

 marked with a network of very fine irregular lines, 

 only to 1)6 seen with the aid of a pocket lens. This 

 poi'tion becomes hard and woody when the gall is fully 

 developed. At the point opposite the base grows the 

 small cone previously mentioned, reddish or yellowish 

 in colour. It is not visible while the rind is soft and 

 thick. 



Aphilothrix Malpighii, Adler. 

 (Plate XXIII, div. A.) 



AndricHs MaljjiyJiii, Mayr, Cameron, Mosley. 



English name of gall. — "Malpighi's Grail." 



Position of gall. — In axillary buds. 



Manner of growth. — Solitary, sessile, slightly pilose, spindle 

 shape. 



Colours. — " Green, often with reddish stripes " (Cameron). 



Average dimensions of a mature specimen. — Height, 

 4 mm. ; breadth, 15 mm. ; girth, 4" 5 mm. 



May be sought during the months of September and October. 



Growth is complete by the end of September. 



The typical condition of the gall is unilocular and unilarval. 



The larva pupates in the gall. The imago emerges during the 

 spring of the second year. 



Alternate sexual generation: Andrictis nuchis, Adler. 



